Demountable-rim-securing nut



Feb. 17, 1931. n w. L. ROCKS'TAD 1,792,711

DEMOUNTABLE RIM SEGURING NUT Filed April 3. 1929 2 SheQts-Sheet 2 Petenfed Feb. 11,1931

UNITED f STATES PATENT OFFICE DmoUNrABLE-nrM-SECURING 'Nur Application led April 3, 1929. Serial No. 352,123.

Thel present invention relates to improvements in nuts and rhas reference more particularly to anut for assoeiationewith a comple'- mentary bolt that extends transversely through the felly of an automobile wheel or spare tire rack to secure a demountable rim thereon. e

One `of the important objects of the present invention is to provide a nut that is of such construction as to require the use of a special tool yto apply orgremove the nut from its bolt so that an ordinary wrench or tool cannot be employed for removing or loosening the nut.

still further object of the invention is to provide an improved nut construction of the above-mentioned character which will protect the tire mounted on the rim of an automobile ing description when taken in connection with the accompanying drawing. A

In the accompanying drawings wherein like reference characters indicate corresponding parts throughout the same:

Figure 1 is a side elevation of an automobiley wheel showing myz improved nut as associated with each of the bolts that' cooperate with the removable lugs to secure the' tire supporting rim on the automobile wheel.

Fi re 2 is a sectional view taken approximate y on the line 2-2 of Figure 1 showing the special tool engaged over the nut to tight` en or loosen the same, the socket portion ofi the tool being shown in section.

Figure 3 is an end elevation of the nut looking at the outer end thereof. y

Figure 4 is asimilar view looking at the inner end of the nut.

Figure 5 is a face view of the socket ofthe special tool that is employed to actuate the nut.

Figure 6 is a detail perspectiveview of the Pnut per se; and

Figure 7 is 'an -elevational view of the special wrench showing the socket portion in section.

In the drawings wherein for the purpose of illustration is shown the preferred embodimentu of my invention, the numeral 1 designates generally an automobile wheel including the tire rim supporting felly 2, the tire rim that is demountably secured on the felly being' indicated by the numeral 3 while the pneumatic tire is shown at 4.

A series of headed bolts 5 extend transversely through the felly 2 at spaced intervals, the heads o the bolts being adapted to engage against the inner side face of the felly in the Ausual manner while detachable lugs 6 are disposed over the threaded ends of the lugs of the bolts for engagement with the outer side face of the felly and for cooperation with the adjacent portion of the demountable rim 3 in t e manner well known in the art.

f In lieu of the ordinary nuts that arel thread.-

ed on the vthreaded ends of the bolts 5 to se- 75 the opposed sides thereof constituting shoulders 11, the purpose of which will be presently described.

For the purpose of turning the nut 7 on the threaded end of the respective bolt for either o tightening or loosening the nut, there is provided a special wrench or tool shown generally at 12 in Figure 7 ofv Athe drawings. This tool includes a shank 13, the intermediate portion of which is formed with a substantially U-shaped handle portion 14. An enlarged head 15 is secured on the outer end of the shank 13 while an enlarged conicalshaped socket member 16 is formed on the other end of the shank 13. This socket member is provided with the conical-shaped socket 1'? to receive the similar shaped nut Z and formed on the inner fece ot the socket adjacent the open outer end thereof is the rib or tooth 18 that is adapted to cooperate with the notch cut-out portion 1Q formed in the inner end portion of the conical-shaped nut in manner to be presently described.

The socket 17 is disposed over the conicalshaped nut 'Z so that the rib 18 will be dis posed Within the notch 10 and the sides of the rib Will cooperate with the shoulder-forming sides 11 of the notch or cut-ont portion l0 to eeet the turning of the nut on the threaded end of the bolt when the shank is turned and obviously by rotating the nut in one direction, the same will be driven home toabut against the outer face of the lug (i whereby to positively secure the lugn in clamping" engagement with the outer face of the folly and the demountable rim.

After all of the nuts have been driven home, the tire supporting' rim will be mounted on the vehicle Wheel against displacement and it will be impossible to remove the tire carrying rim from the Wheel with an ordinary lug-nut or monkey Wrenchr Whenever it becomes necessary to remove the tire carrying rim from the vehicle Wheel folly, the tool l2 must be employed and when the socket 17 is properljgT fitted over the nut 7 so that the rib or tooth 18 engages in the notch 10, the nut may be readily and easily removed from the threaded end of each bolt.

'it will thus be seen from the foregoing description7 that I have provided an improved nut construction for association with the securing means for a demountsible rim that will at all times be positive and ecient in carrying ont the purposes for Wliich it is designed and by the use of' a special nut and tool of the character such asis embodied in the present invention., it Will be impossible for any unauthorized person to remove the tire supporting: rim from the Wheel.

'While l: have shown the preferred embodiment of my invention; is to be understood that minor changes in the sine7 shape eind rangement of parts may be resorted to with ont departing; from the spirit of the invenw tion or the scope of the appended claim.

`What is claimed is 2 A not of the character described compris ing an integral body in the torni, of? a tron--A cated cone and having; s threaded axial. bore, said body having; a longitudinal groove in its external tooleengaging surface extending from the larger inner end oli the body to e point intermediate the ends of the same, the bottom of said groove being;- parallel With the exis ot the body and merging with said toolengjaging surface at said intermediate pointD l'n testimonjgT Whereot l my signature TWALLMER L. EGKSTAD- mentir. 

